Based on the enthalpy changes given for the reactions, which reactions are endothermic? (check all that apply)

2H2O → 2H2 + O2, ΔH = 484 kJ

C + O2 → CO2, ΔH = - 394

kJ H2 + Br2 → 2HBr, ΔH = - 73

kJ 2NH3 → N2 + 3H2, ΔH = 92 kJ

Question

Chemistry

Zachary Maynard

21 December, 17:30

Based on the enthalpy changes given for the reactions, which reactions are endothermic? (check all that apply)

2H2O → 2H2 + O2, ΔH = 484 kJ

C + O2 → CO2, ΔH = - 394

kJ H2 + Br2 → 2HBr, ΔH = - 73

kJ 2NH3 → N2 + 3H2, ΔH = 92 kJ

+3

Answers (2)

Know the Answer?

Jocelyn Hubbard · Answer 1

Based on the given bond energies, what is the enthalpy change for the chemical reaction?

A.

-352 kJ

B.

-210 kJ

C.

-176 kJ

D.

-105 kJ

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Alani Velasquez · Answer 2

In an endothermic reaction, "delta H" is always positive, since the system is absorbing heat from its surroundings, not releasing into the surroundings like in an exothermic reaction where the delta H is always negative.

So our endothermic reactions would be the first (484kJ) and the last (92kJ).

Based on the enthalpy changes given for the reactions, which reactions are endothermic? (check all that apply)2H2O → 2H2 + O2, ΔH = 484 kJC + O2 → CO2, ΔH = - 394kJ H2 + Br2 → 2HBr, ΔH = - 73kJ 2NH3 → N2 + 3H2, ΔH = 92 kJ

Based on the enthalpy changes given for the reactions, which reactions are endothermic? (check all that apply)

2H2O → 2H2 + O2, ΔH = 484 kJ

C + O2 → CO2, ΔH = - 394

kJ H2 + Br2 → 2HBr, ΔH = - 73

kJ 2NH3 → N2 + 3H2, ΔH = 92 kJ